Radio apparatus



Patented May 1 9, 1 931 "PT'LVATYENT FFICE JAMES n. JoRnAN,or-nmvrnunsnitmnojis} sSrenon Toma-testy GRUNOW COMPANY,

orcntioneo, ILLinoIs, A'oonPonArron onim mors RADIOY i Applicationfiledlebruary 5,- 1930;; Serial nd. 426,003.

This invention-relates to devices for 'use in. the manufacture of vacuumtubes, and

particularly to a ig which' will I maintain a r shaped filament andmountin welding position. In order to assemble a vacuum;tube,' care mustbe taken that the electrodes are properly centered withrespectto each;other.

In the manufacturepftubes, in which a long length of cathode,foldedto'aipredetermined shape, is used, it is necessary that theends ofthe cathode-be: welded to the supportingit is essentialjl that no;strainsbeq imposed upon the cathode such as would result if thematerial, were forcibly distorted} into a position diifer'ent from thatW i naturally tends to assume; j Anobject of this av simple jig, whichwill maintain the filament and mount in desired position so that theends of-cthe fil'ament may be welded to its vsupporting wires. rAnother'object's to devise a jigwhichwvill anchor thefilament, so thatin the welding process there will be no tendencyfor the filament to slipout of the r Referring to-the" drawings: p v Figure 1 shows one'sideofthe jig with a portion cut away, havingethe filamentand mount inwelding position; i i i Figure 2 is aplan view t from theother side;

Figures 7 3 and-4 are open positions. respectively;

member." r

. The jigcomprises a handle portion maintainna.shapedfilament 17.

ean is to; devi e Figure 5is a detailed view ofthe noted that plates 4have substantially I v the same outline. Betweenthesetwoplates is aspacing member 9*provided withtwo 'V-shaped spaces 6- and 7,jout ofwhich the metal-fhasfbeen jcut. An aperture 8 is also provided, for apurpose to behereafter ex-v plained. i;It will be noted that the bodyportion'of spacer 9 is narrower than that of platesBI and 4,,With theresult that a plurality ofchannels 10' and 11 are formed, into whicharbors 120i the mount 13 may be, in serted. If desired, grooves maybecut into plates 3 and 4 along channels 10 and '11 toprovidegadditionalxroom for wires 12, in.

the event that spacing member 9 istoo thin.

-B yvirtue of cut-outs 6 and 7 of spacer 9, I it is clearthat'internalchannels'1'5 and 16 are formedwithin the jig and adaptedto In orcler-toanchor the filament welding process, a plurality of apertures 18 areprovided inplate3 and disposed at bights 19and 20,0f theloops of, thefilament. An opening 20" is cut out in plate 4 and within this opening aspring 21; is fastened to: the m jig. Spring 2l carri'es a plurality ofpins 22 that engageapertures 18,.andis adapted-t0 be defiected lby amember 23 projecting lthrough apertures 8 inv the spacer 9 and aregistering'aperture 24: in plate 8.

. In orderfto useth's lg, a shaped filament 1 7 isinsertedwhilespring 21is'defiected out-v wardlyf as shown in Figures. -When the Q -bights l 19and 1 20, of the, filament loops are atapertures 18, spring-member 21 isreleased q 4 andc-omestothe position inFigure 3, with sideviewszotthefjig, with variousportions cut away in: closedzian d the pinsdisposedinside'apertures 18. In this 10 and 11, thus bringing supportwires and 31 in desired position to the ends of filament 17. In" thisposition, the filament may be welded :very easily to its supportingwires. Urea th removal ofpins .18 f m th aper during the ,6

ture, the entire assembly may be pulled out from the jig for furtheroperation.

My invention is not to be restricted to the precise details shown. Thusthe spacer may have a variety of shapes and in fact may be contracteddown to a pin at the junction of cut-out portions 6 and 7 since only thebight anchors are necessary for supporting the filament. The spacer maybe omitted if desired and be effectively replaced by suitably shapedopposing surfaces of plates 3 and 4. The jig may be changed toaccommodate differently shaped filaments if occasion arises.

Iclaim:

1. A jig for maintaining a shaped filament and mount in welding positionconsisting of a plurality of complementary plates, means for maintainingsaid plates in locked relationship, said plates being provided withmeans for maintaining a filament in a V shape and being provided withother means adapted to receive certain of the supporting arbors in saidmount, said plate also having an aperture located where the bight of thefilament occurs, and a removable pin in said channelfor engaging saidfilament bight.

2. A jig adapted to maintain a shaped filament and mount in weldingposition during the assembling of a vacuum-tube consisting of a Hat baseplate provided with an aperture therethrough, a spacing member on thefiat face of said base plate, a fiat plate above said spacing member,means for securing said plates together so that the spacing member isrigidly maintained between said flat plates, said spacing member havinga suitable shape so that internal channels accessible from an edge ofthe jig are formed, the aperture in said base plateoccurring at an endof the filament channel Where the bight of the filament 18 located, apinin said channel adapted to engage the filament and serve as an anchorand means for displacing said pin from said channel.

3. A vacuum tube assembly jig comprising an apertured flat base plate,an other flat plate over said base plate, a spacing member between saidtwo fiat plates, means for clamping said plates together, said spacingmember having a V shaped portion cut-out forming an internal channel topermit a shaped filament to be inserted into the jig,the aperture insaid base plate occurring at the bight'of said V and a removable pin insaid aperture adapted to engage the bight of a filament.

4. A jig for maintaining a shaped filament and mount in weldingposition, comprising two flat plates, a spacer member between saidplates having a V-shaped notch cut out therefrom and definingan internalchannel for a shaped filament, and a movable pin located at the bight ofsaid V.

5. A jig for maintaining a filament and mount in welding position,comprising a flat plate having at least one aperture therethrough, aspacer member above said plate having a V-shaped notch cut outtherefrom, the bight of said notch occurring at the aperture of saidplate, another plate superimposed on said spacing member, means forclamping said plates and member together, a spring member mounted onsaid jig and carrying a pin at one end, said pin registering with saidaperture, and means for deflecting said spring to remove said pin fromsaid aperture.

6. A jig for maintaining a shaped filament and mount in weldingposition, comprising two plates separated by a spacing member, saidspacing member having a W-shaped notch cut out therefrom, defininginternal channels, pins passing through one of said pieces into the twoadjacent bights of the W, and means for withdrawing said pins from theplane of said spacing member.

7. A jig for maintaining a shaped filament and mount in weldingposition, comprising a fiat plate and having a plurality of aperturestherethrough, a spacing member having a W-shaped portion cut outtherefrom and a plate having a plura ity of apertures, a

spacing member having a W-shaped portion cut out therefrom, the twoadjacent bights of the W registering with two of the apertures in saidplate, said spacing member having an additional aperture registeringwith an aperture in said plate, an additional flat plate, means formaintaining said plates and member together, a spring carrying aplurality of pinsmounted on said jig, said ins adapted to lie within thebights of sai W and registering apertures, and means'in said aperturesacting on said spring for with drawing said pins-from said bight. c

'9. A jig comprising a pair of flat lates in face to face relationship,said jig ing provided with an internal channel for the reception of afilament, and a plurality of displaceable pins adapted to serve asanchors to maintain the filament in V-shape.

10.'A jig for maintaining a shaped filament and mount in weldin positioncomprising a pair of flat plates in %ace to face relation, and defininan internal space for the reception of a filament, a plurality of pinsadapted to engage the bights of filament loops and resilient means fordisplacing said pins from said internal space.

11. A jig'for maintaining a shaped filament and mount in Weldingposition comprising a pair of apertured flat plates in face to facerelation; and defining an internal space V for the reception of afilament, a spring strip mounted on said jigand adapted to be deflectedand a plurality of pins carried by said strip and adapted to enter saidapertures to engage the bights of filament loops.

In testimony whereof he alfixes his signature. e

JAMES D. J ORDAN."

